app.py

import streamlit as st

# Title of the app
st.title("Simple Calculator Application")

# Subheader
st.subheader("Select an operation and enter two numbers:")

# Create a dropdown for selecting an operation
operation = st.selectbox(
    "Select an operation:",
    ["Addition", "Subtraction", "Multiplication", "Division"]
)

# Input fields for numbers
num1 = st.number_input("Enter the first number:", format="%.2f")
num2 = st.number_input("Enter the second number:", format="%.2f")

# Calculate button
if st.button("Calculate"):
    # Check if the second number is zero when dividing
    if operation == "Division" and num2 == 0:
        st.error("Error: Division by zero is not allowed!")
    else:
        # Perform the calculation based on the selected operation
        if operation == "Addition":
            result = num1 + num2
            st.write(f"The result of {num1:.2f} + {num2:.2f} is: {result:.2f}")
        elif operation == "Subtraction":
            result = num1 - num2
            st.write(f"The result of {num1:.2f} - {num2:.2f} is: {result:.2f}")
        elif operation == "Multiplication":
            result = num1 * num2
            st.write(f"The result of {num1:.2f} * {num2:.2f} is: {result:.2f}")
        elif operation == "Division":
            result = num1 / num2
            st.write(f"The result of {num1:.2f} / {num2:.2f} is: {result:.2f}")